The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 2010
Filed:
Aug. 04, 2003
Koji Yamada, Odate, JP;
Masahiko Ogino, Kosaka-machi, JP;
Nobuyasu Ezawa, Ageo, JP;
Hiroshi Inoue, Tokyo, JP;
Koji Yamada, Odate, JP;
Masahiko Ogino, Kosaka-machi, JP;
Nobuyasu Ezawa, Ageo, JP;
Hiroshi Inoue, Tokyo, JP;
Dowa Metals & Mining Co., Ltd., Tokyo, JP;
Tanaka Kikinzoku Kogyo K.K., Tokyo, JP;
Kosaka Smelting & Refining Co., Ltd., Tokyo, JP;
Nippon PGM Co., Ltd., Tokyo, JP;
Abstract
A method for recovering platinum group elements comprises charging into a closed electric furnace and melting, together with flux components and a reducing agent, a platinum group element-containing substance to be processed and a copper source material containing copper oxide, sinking molten metal of primarily metallic copper below a molten slag layer of primarily oxides, and enriching the platinum group elements in the molten metal sunk below, and is characterized in that molten slag whose copper content has decreased to 3.0 wt % or less is discharged from the electric furnace and that the copper source material charged into the electric furnace is a granular copper source material of a grain diameter of not less than 0.1 mm and not greater than 10 mm.